The Cool Fish requires two traits fish that requires two different traits to be in your breeding tank to obtain this fish. If you want to breed the Cool Fish then you must use a Smart Fish and Brave Fish and breeding them together because they make up the traits required for the fish.

Evolution Guide

Most fish in Fish with Attitude goes through a process where you must feed them once they have hatched from the egg. Once you feed them for the first time, they will begin growing and once they finish they will become an adult. Once they become an adult you can use them to dig and help you obtain special toys or decorations. You can also increase their earnings by training them but each training will cost you coins.

Earnings

The fish has a max earnings of three stages and you can train them three times. Each time will increase their earnings allowing you to earn more for your tank. All of these costs are different for different fishes.